Safety stop



June 27, 1950 w. J. CAMPBELL SAFETY STOP F iled Aug. 8, 1945 2 Sheets-Sheet 1 INVEN TOR. WILLIHM J. CAMPBELL.

n-BY

RTTORHEY.

June 27, 1950 w. J. CAMPBELL 2 Sheets-Sheet 2 SAFETY STOP Filed Aug. 8, 1945 2e 27 14 Q Y\ l Ill Ill/l/l/III IN V EN TOR.

WILL-MM I Qw LL.

J. C HMPBE LL RTTOE'NEY- Patented June 27, 1950 2,512,609 I L g SAFETY sror...

' Y W il 1iani;I.Campbell, newvorkrnrnni' I ripplication?August'8, 1945,SeriaiNofiGMllM s 2 Claims; (01. 292=-:155)" (Granted under the act of E'Marchr. ;3,i 1883', Jase:

This invention relates to a safety. -stop.usef=ul in conjunction-.twi-th .locking -devices-.onventilation valves, watertight doors and the'like.

- amended April 30, 1928; -370- =Gtuh751b Manyitypes of closure are locked by mechanismcomprising a shaft orrod that=is'-moved lineal-1y into "lockingposition-afterthe closure is "in=the closedposition, preventingthe closure from be-=-* moved into locking position while the closures are in open position. When this is the case, the

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locking mechanisms prevent quick closing of the closures, since they cannot be closed until the locking mechanisms are withdrawn from locking position, an unsatisfactory and unsafe condition.

It is an object of this invention to provide a safety stop for locking mechanisms associated with closures preventing said locking mechanisms from being moved into locking position while said closures are open.

Further objects and advantages of this invention, as well as its construction, arrangement and operation, will be apparent from the following description and claims in connection with the accompanying drawings, in which,

Fig. 1 is a plan view of the safety stop of this invention associated with a ventilation valve, the valve being in closed and locked position.

Fig. 2 is an enlarged fragmentary plan view of the safety stop associated with the ventilation valve of Fig. 1 and its locking mechanism, the latter being shown in unlocked position.

Fig. 3 is a sectional view of the device taken along the line 33 of Fig. 2.

Fig. 4 is an enlarged fragmentary plan view of the safety stop associated with the ventilation valve of Fig. 1 and its locking mechanism, the latter being shown in locked position, and

Fig. 5 is a sectional view of the device taken along the line 5-5 of Fig. 4.

Fig. 1 shows a closure II secured to the center of strongback I2. Strongback I2 is radially affixed to shaft I3, rotatably mounted in frame or flange I4. Shaft I3 can be rotated by means of handle I5.

Slidably mounted on flange I4 opposite shaft I3 is a locking rod or shaft I6. One end of locking shaft I6 is threaded and in threaded engagement with handwheel H, the hub of which is rotatably retained by thrust collars I8. Wedge support I9 is fixedly secured to locking shaft I6 and supports wedge 20 that is positioned and adapted to move into and out of bearing engagement with the end at strongback I2 as locking shaft I6 is moved into andtout nfiilocking position by rotationcofi hand:

wheel II. J I v The;safetystop eomprises two pads z-l mountem lockingsshaft-i'ilzt therethroug pivotally mounted =btween pads 2I that .zis suitably retained; as' bycott Lug 25 extends and is joined by co pads 2| and limits the movement of that arm of bellcrank 22 acted upon by spring 26.

The operation of the safety stop is as follows. The heavier arm of bellcrank 22, that acted upon by spring 26, is normally maintained by spring 26 in a position between pads 2I directly in the path of locking shaft I6 (Figs. 2 and 3). This condition positively prevents locking shaft I6 from being moved into locking position, and assures that wedge support I9 is not in position to interfere with quick closing of closure II.

When closure I I is closed, an edge thereof acts upon an arm of bellcrank 22, which is so designed and positioned that closing of closure II will cause bellcrank 22 to pivot sufiiciently against the force of spring 26 so that the heavy arm of bellcrank 22 is completely withdrawn from the path of locking shaft I6. Locking shaft I6 can then be moved into locking position, and wedge 20 brought into bearing engagement with the end of strongback I2 (Figs. 4. and 5). When locking shaft I6 is withdrawn from looking position and closure II is opened, spring 26 returns bellcrank 22 to safety position preventing movement of locking shaft I6 while closure I I is open.

It will be apparent that the locking mechanism and safety stop can alternatively be mounted on closure I I, with an arm of bellcrank 22 positioned and disposed to be engaged by flange I4, or by a lug projecting therefrom, as closure 1 I is closed.

It is to be understood that various modifications and changes may be made in this invention without departing from the spirit and scope thereof as set forth in the appended claims.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

What is claimed is:

1. A locking device for use aboard ship with a watertight hatch and supporting frame, said device comprising a manually actuated bolt mounted in exposed position for sliding movement on the frame into and out of locking posh tion, means on said bolt in exposed position for engaging the hatch in looking position, a pair of parallel spaced lugs in exposed position on said frame and disposed across the path of bolt travel at the end of the path, said lugs having aligned openings to permit travel of the end of the bolt therethrough into locking position, a removable pin in exposed position between said lugs adjacent the aligned openings and parallel to said bolt, bellcrank rotatably mounted in exposed position on said pin for movement into and of the openings from said pin for limiting movement of the bellcrank into the path of bolt travel, a spring in exposed position between onearm of said bellcrank and the frame for urging the bellcrank into the path of bolt travel and toward said stop, the other arm of said bellcrank being engageable by the hatch in closed position to move said bellcrank out of the path of bolt travel against the action of said spring.

2. A locking device for use aboard ship with a watertight hatch and supporting frame, said devicecomprising a manually actuated bolt mount-- ed for sliding movement on the frame into and out of locking position, means on said bolt for engaging the hatch in looking position, a pair of parallel. spaced lugs on said frame and disposed across the path of bolt travel at the end of the 4 path, said lugs having aligned openings to permit travel of the end of the bolt therethrough into locking position, a removable pin between said lugs adjacent the aligned openings and parallel to said bolt, 9, bellcrank rotatably mounted on said pin for movement into and out of the path of bolt travel, a stop between said lugs on the opposite side of 'the openings from said pin for limiting movement of the bellcrank into the path of bolt travel, a spring between one arm of said bellcrank and the frame for urging the bellcrank into the path of bolt travel and towards said against the action of said spring.

WILLIAIVI J. CAMPBELL.

, REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Palmer Sept. 20, 1921 

